Engine



May 24, 1927.

ENGINE Filed Aug. 12. 1926 C. A. DREISBACH 5 Shuts-Shoot; 1

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1,629,66 1927' c. A. DREISBACH ENGINE Filed Aug. 12. 1925 5Sheets-Sheet; 3

' 1,629 ass 1927' c. A. DR EISBACH v ENGINE Filed M12. 12. 1926 5shuts-sheet 5 A s (HIIL W!!! i located longitudinal slots 48, receivingthe flattened inner end 129, of guide pins 50, seated in sockets 51formed in the cylinder 24:, at opposite points thereon and held in placetherein by screw plugs 52.

nt its opposite ends respectively, each piston is provided on its outerperiphery, with a group of piston rings 53, engaging the interiorsurface of the cylinder 24 and with groups 55 of interior piston ringsembracing the shaft 27.

For the purpose of causing the reciprocating movement of the pistons toeffect the rotation of the shaft 27, I rigidly mount on the latter, andwithin each piston, a drive disc 57, provided with two oppositelyprojecting pins 58, each carrying at its outer end a taper roller 59,fitting snugly in the reversely inclined cam groove 60, in the cammembers 47 aforesaid. Each drive disc 57 as shown, is secured to theshaft 27, by means of a taper-pin 61.

As will be seen from Fig. 9 of the drawings, the cam grooves 60, isshaped to insure two complete reciprocations of any given piston, foreach complete revolution of the shaft 27.

For the purpose of igniting the explosive mixture, when drawn into andcompressed in the combustion chambers, 31, 32, 33, 34 and 35, each ofthese chambers is provided with a radial passage 62 receiving a sparkplug 63 and is located in line with its complementary valve 38, midwaybetween the complementary ports 36 and 37 as clearly shown in Figs. 5 to8 inclusive.

For the purpose of describing the operation of my improved engine, itmay be assumed that the explosive mixture in the end combustionchambers- 31 and have been ignited and the piston has been forced fromleft to right and the piston 23 forced from right to left with theeffect of causing the cam members 47 of the said piston to act throughthe appropriate rollers 59 and drive discs 57 to impart a rotatingmovement to the shaft 27. While the action just described is takingplace, the mixture previously drawn into the combustion chamber will. becompressed between the pistons 20 and Q1 preparatory to ignition while avacuum will be created in the combustion chamber by the separation ofthe pistons 21 and 22. Meanwhile also, the previously exploded mixturein the chamber 34:, will be forced outward through its exhaust port 37by the approach of pistons 22 and 23, toward each other.

From the foregoing it will. be seen that each combustion. chamber inturn has drawn into it a charge of combustible mixture, where it is inturn compressed, exploded and exhausted. It will also be noted that eachpiston completes one cycle of four phases namely, iii-take, compression,explosion and exhaust, once for each revolution of the shaft 27.

I claim 1". An engine comprising a cylinder, a plurality of co-axialreciprocating pistons located therein, means of limiting the saidpistons to movement in a rectilinear path, a rotary shaft extendingcentrally through said pistons, helical cam grooves having reverselyinclined reaches locatedwithin the said pistons, and transmissionmembers secured to the said rotary shaft and engaging the said camgrooves whereby the rectilinear movement of the pistons acts to rotatethe shaft.

2 An engine comprising a cylinder, a plurality of co-axial reciprocatingpistons located therein, means for limiting the said pistons to movementin a rectilinear path, a rotary shaft extending centrally through saidpistons, cam members carried by said pistons within the same and formedwith helical cam grooves having reversely inclined reaches andtransmission members secured to the said rotary shaft and engaging thesaid cam grooves whereby the rectilinear movement of the pistons acts torotate the shaft.

3. An engine, comprising a cylinder, a plurality of co-axialreciprocating pistons located therein, means for limiting the saidpistons to movement in a rectilinear path, a rotary shaft extendingcentrally through said piston, seals between the said pistons and rotaryshaft and between said pistons and cylinder .wall, helical cam-grooveshaving reversely inclined reaches located within said pistons andtransmission members secured t0 the said rotary shaft andengaging thesaid cam-grooves whereby the rectilinear movement of the pistons acts torotate the shaft.

4. An engine comprising a cylinder with a plurality of intake andexhaust ports, a plurality of coaxial reciprocating pistons locatedtherein, means for limiting the said pistons to movement in arectilinear path, a plurality of rotary valves also located in the saidcylinder for covering and uncovering the said intake and exhaust ports,a rotary shaft extending centrally through said pistons, cam memberscarried by said pistons within the same and formed with helical camgrooves having reversely inclined reaches, and transmission memberssecured to the said rotary shaft and engaging the said cam: grooveswhereby the rectilinear movement of the pistons acts to rotate theshaft.

5. Anengine comprising a cylinder, a plurality of co-axialreciprocatingpistons located therein in such a manner as to virtuallydivide the same into a series of combustion chambers, intake and exhaustports for the said chamberspmeans for limiting the said pistons tomovement in a rectilinear path, a rotary shaft extending centrallythrough said pistons, cam members carried by said pistons Within thesame and formed With helical cam grooves having reversely inclinedreaches, and transmission members secured to the said rotary shaft andengaging the said cam grooves whereby the rectilinear movement of thepistons acts to rotate the shaft.

6. An engine comprising a cylinder, a plurality of co-aXialreciprocating pistons located therein in such a manner as to virtuallydivide the same into a series of combustion chambers, intake and exhaustports for the said chambers, means for limiting the said pistons tomovement in a rectilinear path, a rotary shaft extending centrallythrough saidpistons, rotary valves located in said combustion chambersfor covering and uncovering the said ports.

In testimony whereof, I have signed this specification.

CHARLES A. D-REISBACH.

